Furnace of steam-boilers



4UNITE LEMAN BRADLEY, OF SHARON, CONNECTICUT.

' FURNACE OF STEAM-BOILERS.

Specification of Letters Patent No. 3,853, dated December 12, 1844-.

T0 all 'whom t may concern Be it known that I, LEMAN BRADLEY, of Sharon, in the county of Litchfield and State of Connecticut, have invented a new and use ful Improvement in Steam-Boilers; and l do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawing, in which- Figure 1, is a longitudinal section vertically through the center. metrical view of the re chamber with the front of the boiler removed. Fig. 3, is a section of the front of the boiler through A, B, of Fig. 1.

The letters in all the figures designate similar parts. A

The nature of my invention consists in the method of conducting the air into thefire chamber and driving off the products of combustion by which a more intense heat is produced and a saving of fuel effected.

The apparatus can be combined with any shaped boiler but that which shall describe and figure is the common wagon shaped boiler represented in the different gures and designated by the letter a. In the front end of this boiler is a fire chamber which is a rectangular box` Z), the front of which is formed by the front plate c, of the boiler; attached to said front plate there is a smoke flue al, that extends from near the bottom of the fire chamber up above its top, where it joins a horizontal pipe e, that extends horizontally through the boiler as represented at Fig. l; this pipe may run out at the other end of the boiler horizontally, or may turn upward near the rear end, and then turn again horizontally out, as shown by the drawing; after it leaves the end of the boiler it turns downward, and terminates in a reservoir f, at the bottom of the smokestack g; said reservoir f, is filled with water vabove the mouth of the pipe c. Near the lower end of the upright flue cl, above named, a twyer or nozzle of the air pipe 7i, (which connects with a cylinder bellows of common construction) passes through into the tire chamber; this nozzle is stopped air tight Fig. 2 is an iso-` when it passes into the flue but the aperture z', in the flue, when the nozzle enters the fire chamber, is large enoughto have a space sufficient for all the products of combustion to pass through around the blast that is blown in through the nozzle of pipe z.. Just above this opening t', there is a row of tubes c, which communicate with the boiler; they form the grate on which the fuel is placed. Just above them are the doors Z,in the front plate of the boiler, one'on each side of the flue d. Near the top of the tire chamber are a similar row of tubes to those before named, and these are lettered m. Below them and over each of the doors of the fire chamber are air pipes n leading from the bellows, so

i that when the apparatus is in operation there will be a current of air into the fire chamber above and below the fuel which will meet, and when the pressure issuiiicient, the smoke Sac., will be forced out down around the nozzle of pipe h, and through flue d, e, and passing through the water'will be discharged into the smokestack. In `the drawings the red arrows denote the air blast, and the black arrows the course of the smoke. By forcing the products of combustion through the water any amount o-f pressure may be maintained in the fire chamber, by having the water more or less deep, and by it all the sparks will be effectually extinguished.

Having thus fully described my invention what I claim therein as new and desire to secure by Letters Patent isl. Forcing t-he air into the fire chamber in the manner described above and below theV LEMAN BRADLEY.

Witnesses:

J. J. GREENOUGH, RICHARD KEY WATTS. 

